PRECISION CELESTIAL NAVIGATION EXPERIMENTS
SHUFELDT (HENRY H) ANNAPOLIS MD
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This study is summarized as follows 1 The 20 x 50 mm prismatic monocular of good manufacture, is superior to any sextant telescope of lesser power during daylight hours. It reduces the random errors in a series of observations, as its great magnification permits the greatest nicety of obtaining contact between the body and the horizon. It is entirely satisfactory for use aboard ship except in extremely bad conditions of wind and sea. 2 similarly the 7 x 50 mm prismatic monocular is superior to any other telescope available for test when the horizon is poorly defined, due to darkness. 3 A dip meter, fitted with a high power telescope, and capable of determining empirically the value of the dip to one-tenth of a minute of arc is an essential adjunct to the sextant, where accuracy is of primary importance.
- Navigation and Guidance